Operation of Controller
880 Operation Manual Issue 7 EMC INDUSTRIAL GROUP LTD Page 13 of 25
• When an alarm occurs, the alarm number mnemonic is shown if the ALARM
CANCEL key is pressed. See Alarm List, page 15.
Small Display
• When the controller is stopped it shows the program number.
• When the controller is running, it shows the current stage number. For exam-
ple, if the program has got to the ramp of stage 2, the display shows r2.
• When programming, it flashes and shows the stage number of the setting
value shown in the large display.
• When an alarm occurs, the alarm number is shown if the ALARM CANCEL
key is pressed. See Alarm List, page 15.
Beeper
The internal beeper is used as an audible indication for three events.
• When any key is pressed a single beep indicates a valid key press has been
entered.
• Five long beeps indicate the firing is completed.
• If any alarm occurs bursts of five fast beeps are repeated until the ALARM
CANCEL key is pressed to acknowledge the presence of an alarm.
Power Up Test
When the controller is powered up, the displays sequentially show a display test,
the software revision number and model number, the code of an option card if fitted
and finally shows the sensor code and type of sensor the controller has been set
for.
Power Up
Sequence
Description of Displayed Information
1 All display segments and indicator lights turn on normally but if unit
has been set to Demo Mode, see Demo Mode, page 23, the large
display shows ! with all indicator lights on.
2 Small display shows software revision number and large display
shows model number. eg
"
##.
3
If option card OP-1 is fitted large display shows $.
4 Small display shows input sensor code number and large display
shows sensor type.
Input Sensor Type Displayed Code Number & Mnemonic
J T/C
%
K T/C
N T/C
&
R T/C
"
'
T T/C
PT100 RTD
'
5 Normal operating display. Small display shows program number and
large display shows kiln temperature. eg
If any segment or light does not turn on or the display is blank and the beeper
sounds or the display shows
(, the unit is faulty and should be returned
for service.
Power Failure
If power fails during a firing, the controller remembers what it was doing at that
time.
The controller has been factory set to automatically continue the firing from the
point in the temperature profile at which power failed.
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